64645207240 has 64 divisors (see below), whose sum is σ = 146818137600. Its totient is φ = 25615414272.

The previous prime is 64645207217. The next prime is 64645207243. The reversal of 64645207240 is 4270254646.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 64645207193 and 64645207202.

It is not an unprimeable number, because it can be changed into a prime (64645207243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13932841 + ... + 13937479.

It is an arithmetic number, because the mean of its divisors is an integer number (2294033400).

Almost surely, 2^64645207240 is an apocalyptic number.

It is an amenable number.

64645207240 is an abundant number, since it is smaller than the sum of its proper divisors (82172930360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64645207240 is a wasteful number, since it uses less digits than its factorization.

64645207240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7846 (or 7842 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 40.

The spelling of 64645207240 in words is "sixty-four billion, six hundred forty-five million, two hundred seven thousand, two hundred forty".